Can you provide more information about your company please? It really depends on the certain specs and purposes for it because both systems are good and have their advantages/disadvantages, so without more detailed information it's really hard to give you the best recommendation
ERP for example is better because of:

- providing timely and accurate access to various information and improving general communication between all units in your company
- reducing your general costs with the help of automating any type of processes
- improving speed and quality for general decision making https://idapgroup.com/blog/crm-and-erp-whats-the-difference/
- better organized data and security

On the other hand CRM systems have such pros:

- reducing daily costs because of increasing the general productivity
- speeding up the conversion processes
- allowing data mining (for better managing of your business and fast correcting possible mistakes https://brandongaille.com/12-pros-and-cons-of-customer-relationship-management/ )
- it's an easy system for later modifying and upgrading which is important for growing companies for example